底层捕捞对有机碳及相关生物地球化学影响的全球荟萃分析

IF 5.6 1区 农林科学 Q1 FISHERIES
Justin Tiano, Emil De Borger, Sarah Paradis, Clare Bradshaw, Claudia Morys, Antonio Pusceddu, Claudia Ennas, Karline Soetaert, Pere Puig, Pere Masqué, Marija Sciberras
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引用次数: 0

摘要

渔业对海底碳的潜在威胁是一个日益受到关注的话题,但现有文献中的观点并不一致,导致专家们对这一话题众说纷纭。我们进行了一项全球荟萃分析,以综合现有知识并量化底层捕捞对各种生物地球化学特性的影响。直接影响研究显示,叶绿素-a(Chl-a,17%)、辉光素(24%)和蛋白质(32%)总体减少。对这些活性化合物的影响在表层沉积物(0-2 厘米)上更为明显,对总有机碳(TOC)的影响也很显著,这证明了渔具穿透力的影响,并突出表明结合沉积层的取样策略可能会掩盖观察到的影响。水流速度和初级生产力对捕鱼影响的方向和程度有很大影响。在低能量生境中,拖网引起的次表层总有机碳减少可能会影响碳固存,因为半反应碳被优先去除。耐人寻味的是,捕捞强度梯度研究显示,长期捕捞区域的总有机碳平均增加,这可能反映了对中富营养化区域的捕捞偏好。我们估计捕捞后 Chl-a 的恢复期约为 300 天,但其他参数的数值不太确定。有关季节性、渔具类型的数据有限,热带和深海区域的研究代表性不足,这些都为量化底层捕捞对全球范围地球化学的影响带来了挑战。在了解受干扰有机物的归宿(包括其矿化、迁移和固存)方面仍然存在知识差距。尽管如此,我们的见解和估计提供了基础知识,有助于以科学为基础的空间渔业管理方法,同时保护海底的自然碳动态。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Global meta-analysis of demersal fishing impacts on organic carbon and associated biogeochemistry

Global meta-analysis of demersal fishing impacts on organic carbon and associated biogeochemistry

The potential threat of fisheries on seabed carbon is a topic of growing concern, yet existing literature presents inconsistencies leaving experts divided on the topic. We conducted a global meta-analysis to synthesize the current knowledge and quantify how demersal fishing impacts various biogeochemical properties. Direct impact studies revealed overall reductions in chlorophyll-a (Chl-a, 17%), phaeopigments (24%), and proteins (32%). Effects on these reactive compounds were more pronounced on surface sediment (0–2 cm), where the impact on total organic carbon (TOC) also became significant, demonstrating the effect of gear penetration, and highlighting that sampling strategies combining sediment layers can mask observed effects. Current velocity and primary productivity significantly influenced the direction and magnitude of fishing impacts. Trawling-induced subsurface reductions of TOC in low-energy habitats may affect carbon sequestration due to the preferential removal of semi-reactive carbon. Intriguingly, fishing intensity gradient studies showed an average increase in TOC in chronically fished areas, possibly reflecting fishing preferences for meso-eutrophic grounds. We estimate a ~300-day recovery period post-fishing for Chl-a, though values for other parameters are less certain. Limited data on seasonality, gear types, and an under-representation of studies in tropical and deep-sea areas pose challenges to quantifying global scale geochemical impacts of demersal fisheries. Knowledge gaps persist in understanding the fate of disturbed organic matter including its mineralization, transport, and sequestration. Nonetheless, our insights and estimates provide foundational knowledge that can contribute to science-based approaches for spatial fisheries management while preserving natural carbon dynamics on the seabed.

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来源期刊
Fish and Fisheries
Fish and Fisheries 农林科学-渔业
CiteScore
12.80
自引率
6.00%
发文量
83
期刊介绍: Fish and Fisheries adopts a broad, interdisciplinary approach to the subject of fish biology and fisheries. It draws contributions in the form of major synoptic papers and syntheses or meta-analyses that lay out new approaches, re-examine existing findings, methods or theory, and discuss papers and commentaries from diverse areas. Focal areas include fish palaeontology, molecular biology and ecology, genetics, biochemistry, physiology, ecology, behaviour, evolutionary studies, conservation, assessment, population dynamics, mathematical modelling, ecosystem analysis and the social, economic and policy aspects of fisheries where they are grounded in a scientific approach. A paper in Fish and Fisheries must draw upon all key elements of the existing literature on a topic, normally have a broad geographic and/or taxonomic scope, and provide general points which make it compelling to a wide range of readers whatever their geographical location. So, in short, we aim to publish articles that make syntheses of old or synoptic, long-term or spatially widespread data, introduce or consolidate fresh concepts or theory, or, in the Ghoti section, briefly justify preliminary, new synoptic ideas. Please note that authors of submissions not meeting this mandate will be directed to the appropriate primary literature.
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